Figure 5. Surface fine structure of male gamete in Pseudostaurosira trainorii and its thread and projections.

SEM. Scales  =  2 µm. A. Gamete with a thread as well as finer projections that vary in shape from a long type (top and middle, ± parallel to the thread) to a short, finger-like type (bottom). B. Gamete with a finer projection extending from a blob, corresponding to the LM observation in Fig. 3. C. Gamete with thread, blob and finer projection, the last of which seems to stem from the base of the blob. Arrow and arrowhead indicate thread and finer projections, respectively. Double arrow indicates blob.